import Vue from "vue"
const isServer = Vue.prototype.$isServer

/* istanbul ignore next */
export const on = (function() {
    if (!isServer && document.addEventListener) {
        return function(element, event, handler, useCapture = false) {
            if (element && event && handler) {
                element.addEventListener(event, handler, useCapture)
            }
        }
    } else {
        return function(element, event, handler) {
            if (element && event && handler) {
                element.attachEvent("on" + event, handler)
            }
        }
    }
})()

/* istanbul ignore next */
export const off = (function() {
    if (!isServer && document.removeEventListener) {
        return function(element, event, handler, useCapture = false) {
            if (element && event) {
                element.removeEventListener(event, handler, useCapture)
            }
        }
    } else {
        return function(element, event, handler) {
            if (element && event) {
                element.detachEvent("on" + event, handler)
            }
        }
    }
})()
